-Update from WebTranslator v3.0:
croatian - 5 changes by VoyagerOne
dutch - 50 changes by habell
norwegian_bokmal - 16 changes by cuthbert
russian - 2 changes by Lone_Wolf
slovak - 18 changes by Milsa


git-svn-id: http://svn.openttd.org/trunk@26553 6aa0318a-3be1-0310-93fa-89fd2396df07